Sewing-machine



mammal. v

E. T. THOMAS.

Sewing Machine. NO. 243,326. Patented June 21,1881.

Fig.1.

j UNITED STATES PATENT OFFICE.

EDDY T. THOMAS, OF NEW YORK, N. Y., ASSIGNOR TO THE GOLD MEDAL SEWING MACHINE COMPANY, OF ORANGE, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 243,326, dated June 21, 1881,

Application filed January 24, 1881. (No model.)

To all whom it may concern Be it known that I, EDDY T. THOMAS, of New York, county of New York, and State of New York, have invented Improvements in Sewing- Machines, of which the following description, in connection with the accompanying drawings, is a specification.

This invention relates to improvements in sewing-machines of that class employing an eye-pointed needle and shuttle and making the lock or shuttle stitch; and my invention has for its object to simplify the construction of the same, as will be hereinafter described.

My invention consists in the combination, with the rotary needle-bar-actuating shaft in the overhanging arm, eccentric thereon, and rack-bar actuated by the said eccentric, of a rocker-shaft and a pinion thereon engaged by the said rack-bar, and a shuttle-carrier secured to the said rocker-shaft. I make this same rocker-shaft which vibrates the shuttle-carrier the means for imparting movement to the fourmotioned feed-bar, by providing it with a cam which raises the said feed-bar and permits it to fall, while a lateral pin or projection on the said cam, working on a forked lever having an adjustable fulcrum, imparts to the feed-barits backward and forward movement.

Figure 1 represents, in side elevation and partial section, a sufficient portion of a sewingmachine to illustrate my invention. Fig. 2 is a section of Fig. l on the dotted lines at m. Fig. 3 is a section on the dotted line x 00 Fig. 1, to show the feeding mechanism. Fig. 4 is a detail of the feed-bar. Fig. 5 is a detail of the shuttle-carrier and its connected parts, and Fig. 6 is a modification representing a difierent form of rack-bar.

The frame-work a, overhanging arm a, rotating shaft (0 therein, and crank-pin a", which is to enter the so-called heart-shaped groove in a plate connected, as usual, with the needlebar, but not shown, are supposed to be the same as in the well-known New Home sewing-machine. The shaft a has upon it an eccentric, b, which actuates the rack-bar b the teeth of which engage the pinion b on the shuttle-carrier rock-shaft b and impart to the said shaft a rotary reciprocating movement, causing the shuttle-carrier 0, provided with suitable horns, to carry the shuttle through theloop, which will be formed in the usual manner on the needlethread. The face of the shuttle will be kept pressed up against the face of the shuttle-race 2, and down on the carrier by the carrier-sprin g c. The shuttle (not shown in the drawings, to avoid confusion of lines) will be of usual construction.

The shaft b has connected with it a cam, 11, of proper shape to lift the feed-bar e at the proper time to engage the material to be fed along under the usual presser-foot and needle,

(not shown,) and to permit the said feed-bar to fall at the proper time under the pressure of the spring 3. At its front side this cam 61 has extended laterally from it a stud or projection, (1 (see Fig. 3,) which at proper times during the movements ofthe rocking-shaft b acts upon one or the other of the two legs of the forked feed-moving lever g, pivoted at its upper end, as at k, to the feed-bar c. This forked lever is slotted, as shown in Fig. 4, to surround the fulcrum 4 on the movable fulcrum bar h, pivoted at one end, at 5, to a lug, 6, of the frame-work, while its other end is suitably slotted, so that it may be adjusted and held in adjusted position by the set-screw 1'. Elevation or depression of the said fulcrum-bar will vary the position of the fulcrum 4, and consequently change the throw of the lever g and feed-bar.

In connection with the feed-bar I have shown a back-stop, I, which regulates the backward movement of the feed, and consequently the length of the stitch, the lug m of the feed-bar striking against the said stop. This back-stop is of usual construction, and, as herein shown, is the forward end of the pivoted lever a.

In Fig. 6, Ihave shown the rack-bar arranged to vibrate about the center 0, instead of to reciprocate, as in Fig. 2. The rack-bar in Fig. 2 is kept in'engagement with the teeth of the pinion by means of the arm 19, which bears against the right-hand side of shaft b while the rack and pinion engage on the left-hand side.

I claim-' 1. In a sewing-machine for making a lock or shuttle stitch, the frame-work, rotating needlebar-actuatin g shaft, eccentric thereon, and verticallyreciprocating rack-bar provided with the arm 19 and actuated from the said eccentric, combined with the rocker-shaft 1), its pinion b and vibrating shuttle-carrier connected there- I d and feed-bar and forked feed-moving lever with, substantially as described. pivoted thereon, combined with the movable 2. Theframe-work,rotating needle-har-actubar h and fulcrum 4 for the said feed-moving r 5 ating shaft, and eccentric thereon,the rack-bar lever, to operate as and for the purpose de- 5 actuated thereby, and the rocker-shaft 1), its scribed.

pinion b and vibrating shuttle-carrier 0. con- In testimony whereof I have signed myname nected therewith, combined with the feed-cam to this specification iu the presence of two subd, the stud d thereon, feed-bar e, forked feedscribing witnesses.

moving lever pivoted thereon, and the ad- EDDY TAYLOR THOMAS. 1o justable fulcrum therefor, substantially as de- Witnesses:

scribed. BERNARD J. KELLY,

3. The rocker-shaft I), earn d and its stud SAML. D. TOMPKINS. 

